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config.go
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/
config.go
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// Copyright The HTNN Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package opa
import (
"context"
"errors"
"fmt"
"net/http"
"regexp"
"time"
"github.com/open-policy-agent/opa/rego"
"mosn.io/htnn/pkg/filtermanager/api"
"mosn.io/htnn/pkg/plugins"
)
const (
Name = "opa"
)
func init() {
plugins.RegisterHttpPlugin(Name, &plugin{})
}
type plugin struct {
plugins.PluginMethodDefaultImpl
}
func (p *plugin) Type() plugins.PluginType {
return plugins.TypeAuthz
}
func (p *plugin) Order() plugins.PluginOrder {
return plugins.PluginOrder{
Position: plugins.OrderPositionAuthz,
}
}
func (p *plugin) Factory() api.FilterFactory {
return factory
}
func (p *plugin) Config() api.PluginConfig {
return &config{}
}
type config struct {
Config
client *http.Client
query rego.PreparedEvalQuery
}
var (
pkgMatcher = regexp.MustCompile(`^package\s+(\w+)\s`)
)
func (conf *config) Validate() error {
err := conf.Config.Validate()
if err != nil {
return err
}
local := conf.GetLocal()
if local != nil {
module := local.Text
match := pkgMatcher.FindStringSubmatch(module)
if len(match) < 2 {
return errors.New("invalid Local.Text: bad package name")
}
policy := match[1]
ctx := context.Background()
_, err := rego.New(
rego.Query(fmt.Sprintf("allow = data.%s.allow", policy)),
rego.Module(fmt.Sprintf("%s.rego", policy), module),
).PrepareForEval(ctx)
if err != nil {
return err
}
}
return nil
}
func (conf *config) Init(cb api.ConfigCallbackHandler) error {
remote := conf.GetRemote()
if remote != nil {
conf.client = &http.Client{Timeout: 200 * time.Millisecond}
return nil
}
local := conf.GetLocal()
module := local.Text
match := pkgMatcher.FindStringSubmatch(module)
policy := match[1]
ctx := context.Background()
query, _ := rego.New(
rego.Query(fmt.Sprintf("allow = data.%s.allow", policy)),
rego.Module(fmt.Sprintf("%s.rego", policy), module),
).PrepareForEval(ctx)
conf.query = query
return nil
}